Air conditioning control system and control method

Abstract

To provide an air-conditioning control system and a control method capable of minimizing a required time to make an indoor temperature reach a predetermined target temperature in an air conditioning system.SOLUTION: A processor 101 determines a first set temperature as a set temperature when an absolute value of the difference between a target temperature and an indoor temperature is a first value. The processor 101 determines a second set temperature as the set temperature when the absolute value of the difference between the target temperature and the indoor temperature is a second value smaller than the first value. An absolute value of the difference between the first set temperature and the target temperature is larger than an absolute value of the difference between the second set temperature and the target temperature. The processor 101 performs feedback control to calculate an operation command value to a cold / hot water two-way valve 31 according to the difference between the set temperature and the indoor temperature.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to an air conditioning control system and a control method for controlling an air conditioning system that adjusts an indoor temperature to a preset target temperature. [Background technology]

[0002] One method of controlling the room temperature using a central air conditioner is to control the hot and cold water valve or the supply air fan based on the measured room temperature. For example, Japanese Patent Application Laid-Open No. 2012-107787 (Patent Document 1) describes an air conditioning control device that calculates the operation amount of the hot and cold water valve based on the deviation between the measured value of the supply air temperature and the set value. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-107787 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when controlling the indoor temperature so that it ultimately reaches a target temperature preset by a user while performing temperature control to make the indoor temperature follow a set temperature, it is common to set the set temperature equal to the target temperature (fixed value). If the temperature to be followed (set temperature) in temperature control is set to a fixed value, for example, when the air conditioner is started, when switching between cooling and heating, or when the user significantly changes the target temperature, it takes a long time for the indoor temperature to reach the target temperature.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide an air conditioning control system and control method that can minimize the time required for the indoor temperature in an air conditioning system to reach a predetermined target temperature. [Means for solving the problem]

[0006] An air conditioning control system according to the present disclosure is a system for controlling an air conditioning system that adjusts the indoor temperature of a room to a preset target temperature. The air conditioning control system includes a processor and a memory that stores a program executable by the processor. The air conditioning system includes a sensor that detects the indoor temperature and an operating device that operates according to commands from the air conditioning control system. The processor determines a first set temperature as the set temperature when the absolute value of the difference between the target temperature and the indoor temperature is a first value. The processor determines a second set temperature as the set temperature when the absolute value of the difference between the target temperature and the indoor temperature is a second value smaller than the first value. The absolute value of the difference between the first set temperature and the target temperature is greater than the absolute value of the difference between the second set temperature and the target temperature. The processor performs feedback control to calculate an operation command value for the operating device according to the difference between the set temperature and the indoor temperature.

[0007] A control method according to the present disclosure is a control method for an air conditioning control system that controls an air conditioning system that adjusts the indoor temperature of a room to a preset target temperature. The air conditioning system includes a sensor that detects the indoor temperature and an operating device that operates according to commands from the air conditioning control system. The control method includes the steps of: determining a first set temperature as the set temperature when the absolute value of the difference between the target temperature and the indoor temperature is a first value; and determining a second set temperature as the set temperature when the absolute value of the difference between the target temperature and the indoor temperature is a second value smaller than the first value. The absolute value of the difference between the first set temperature and the target temperature is greater than the absolute value of the difference between the second set temperature and the target temperature. The control method further includes the step of performing feedback control to calculate an operation command value for the operating device according to the difference between the set temperature and the indoor temperature. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to minimize the time required for the indoor temperature in an air conditioning system to reach a preset target temperature, thereby making the indoor space more comfortable. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a diagram illustrating an example of a hardware configuration of a control system and an air conditioning system. [Figure 2] FIG. 10 is a diagram for explaining the temperature control process when the set temperature calculation function is OFF. [Figure 3] FIG. 10 is a diagram illustrating a state of temperature control when the set temperature calculation function is OFF. [Figure 4] 10A and 10B are diagrams for explaining the temperature control process when the set temperature calculation function is ON. [Figure 5] FIG. 10 is a diagram showing the state of temperature control when the set temperature calculation function is ON. [Figure 6] FIG. 10 is a diagram illustrating the state of temperature control when the coefficient is changed. [Figure 7] FIG. 4 is a diagram illustrating an example of a display on a display unit. [Figure 8] 10 is a flowchart of a process executed by the control system. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. The names and functions of these components are also the same. Therefore, detailed descriptions thereof will not be repeated.

[0011] 1 is a diagram showing an example of the hardware configuration of a control system 10 and an air conditioning system 400. In this embodiment, a building has a plurality of rooms 20. The building is equipped with an air conditioning system 400 and a control system (also referred to as an "air conditioning control system") 10.

[0012] The control system 10 controls the air conditioning system 400. The air conditioning system 400 adjusts the indoor temperature of the room 20 to a preset target temperature in accordance with commands from the control system 10. The air conditioning system 400 includes an air conditioner 51, a temperature sensor 21 that detects the indoor temperature, and a humidity sensor 22 that detects the indoor humidity.

[0013] The air conditioner 51 is equipped with a chilled / hot water coil 32, an intake air fan 41, and an exhaust fan 42. The air conditioner 51 operates the intake air fan 41 to take in outside air OA from outside the building. The temperature of the taken-in outside air OA is adjusted by the chilled / hot water coil 32, and the outside air OA is sent to the room 20 via a duct as supply air SA. The temperature inside the duct can be detected by a temperature sensor 23 installed inside the duct. The air conditioner 51 operates the exhaust fan 42 to take in return air RA from the room 20 and discharge it to the outside of the building as exhaust air EA.

[0014] Chilled or hot water is supplied to the chilled or hot water coil 32 via a flow path 33. The supplied chilled or hot water is water that has been cooled or heated in advance to a predetermined temperature. Outside air OA taken in from outside the building is passed through the chilled or hot water coil 32 for heat exchange and then supplied to the room 20. When chilled water is supplied, the outside air OA is cooled, and when hot water is supplied, the outside air OA is heated. The supplied chilled or hot water is discharged outside the chilled or hot water coil 32 via a flow path 34.

[0015] A cold / hot water two-way valve 31 is installed in the flow path 34. The flow rate of cold / hot water supplied to the cold / hot water coil 32 is adjusted by the cold / hot water two-way valve 31. The cold / hot water two-way valve 31 operates as an operating device that operates according to commands from the control system 10.

[0016] Increasing the opening of the chilled / hot water two-way valve 31 increases the flow rate of chilled / hot water supplied to the chilled / hot water coil 32. On the other hand, decreasing the opening of the chilled / hot water two-way valve 31 decreases the flow rate of chilled / hot water supplied to the chilled / hot water coil 32.

[0017] When the temperature of the chilled or hot water is low relative to the outside air OA, increasing the opening of the chilled or hot water two-way valve 31 makes it easier to lower the temperature of the outside air OA, and decreasing the opening of the chilled or hot water two-way valve 31 makes it harder to lower the temperature of the outside air OA. When the temperature of the chilled or hot water is high relative to the outside air OA, increasing the opening of the chilled or hot water two-way valve 31 makes it easier to raise the temperature of the outside air OA, and decreasing the opening of the chilled or hot water two-way valve 31 makes it harder to raise the temperature of the outside air OA.

[0018] The control system 10 can raise or lower the indoor temperature of the room 20 by instructing the opening degree of the chilled / hot water two-way valve 31 as an operation command value for the chilled / hot water two-way valve 31. Note that the system is not limited to the system in which the chilled / hot water coil 32 is installed as described above, and may also be a system in which a chilled water coil for supplying chilled water and a hot water coil for supplying hot water are installed separately.

[0019] The control system 10 includes a control device 100, a server 200, and a terminal 300. The control device 100 is, for example, a programmable logic controller (PLC). The control device 100 is capable of communicating with an air conditioning system 400 and the server 200. The terminal 300 is capable of communicating with the server 200.

[0020] The server 200 is capable of monitoring and controlling the air conditioning system 400 via the control device 100. Various types of information acquired by the server 200 are transmitted to the terminal 300.

[0021] The terminal 300 is used by a building manager. The display unit 320 included in the terminal 300 displays various information acquired by the server 200. Furthermore, the air conditioning system 400 can be controlled by operations performed from the input unit 310 of the terminal 300.

[0022] The control device 100 includes a processor 101, a memory 102, a communication interface (not shown) for connecting to the server 200, and an input / output card (not shown) for connecting to the air conditioning system 400. These are connected to each other via a bus so that they can communicate with each other. The processor 101 is a CPU (Central Processing Unit). The memory 102 is composed of a ROM (Read Only Memory), a RAM (Random Access Memory), and a storage unit.

[0023] The CPU loads programs stored in the ROM into the RAM and executes them to realize various functions of the control device 100. The ROM stores programs that describe the processing procedures of the control device 100. The RAM serves as a working area when the CPU executes the programs, and temporarily stores programs and data used when executing the programs. The storage unit is a non-volatile storage device. The storage unit may be, for example, an HDD (Hard Disk Drive) or an SSD (Solid State Drive).

[0024] The control device 100 inputs and outputs signals of the air conditioning system 400 via input and output cards. The input and output cards are made up of a digital input (also referred to as "DI") card for inputting digital signals, an analog input (also referred to as "AI") card for inputting analog signals, a digital output (also referred to as "DO") card for outputting digital signals, and an analog output (also referred to as "AO") card for outputting analog signals.

[0025] Each input / output card has a terminal block with multiple terminals. The air conditioning system 400 inputs digital signals to the control device 100 via terminals on the terminal block of the DI card. The air conditioning system 400 inputs analog signals to the control device 100 via terminals on the terminal block of the AI ​​card. The control device 100 outputs digital signals to the air conditioning system 400 via terminals on the terminal block of the DO card. The control device 100 outputs analog signals to the air conditioning system 400 via terminals on the terminal block of the AO card.

[0026] For example, the control device 100 acquires analog signals (measured values ​​of temperature and humidity) from the temperature sensor 21, the humidity sensor 22, and the temperature sensor 23 via an AI card. The control device 100 outputs an analog signal (opening degree of the chilled / hot water two-way valve 31) to the chilled / hot water two-way valve 31 via the AO card.

[0027] The signal output from the air conditioning system 400 can be acquired ultimately by the server 200 via the control device 100. The signal output from the server 200 is transmitted to the air conditioning system 400 via the control device 100.

[0028] The server 200 includes a processor (CPU), a memory, and a communication interface (not shown). These are connected to each other via a bus so that they can communicate with each other. The memory may include a ROM, a RAM, and a storage unit.

[0029] The CPU loads programs stored in the ROM into the RAM and executes them to realize various functions of the server 200. The ROM stores programs that describe the processing procedures of the server 200. The RAM serves as a working area when the CPU executes the programs, and temporarily stores the programs and data used to execute the programs. The storage unit is a non-volatile storage device, and may be an HDD, SSD, or the like.

[0030] The terminal 300 includes a CPU, ROM, RAM, a storage unit, a communication interface, an input unit 310, and a display unit 320, all of which are not shown in the figure. These are connected to each other via a bus so that they can communicate with each other.

[0031] The CPU loads programs stored in the ROM into the RAM and executes them to realize various functions of the terminal 300. The ROM stores programs that describe the processing procedures of the terminal 300. The RAM serves as a working area when the CPU executes the programs, and temporarily stores programs, data used to execute the programs, etc. The storage unit is a non-volatile storage device, and may be an HDD, SSD, etc.

[0032] The input unit 310 accepts input from a user. The input unit 310 is, for example, a touch panel, but may also be a keyboard or a mouse. The display unit 320 displays various types of information. The display unit 320 is, for example, a liquid crystal display or a display.

[0033] The control device 100 performs feedback control to control the indoor temperature of the room 20 to a target temperature ultimately set by the user. The control device 100 has a set temperature calculation function. First, temperature control when the set temperature calculation function is OFF will be described using Figs. 2 and 3, and then temperature control when the set temperature calculation function is ON will be described using Fig. 4 and subsequent figures.

[0034] 2 is a diagram for explaining the temperature control process when the set temperature calculation function is OFF. The control device 100 includes a feedback control unit 202. The control device 100 controls the air conditioning system 400 so that the indoor temperature of the room 20 eventually reaches the target temperature. The control device 100 performs feedback control so that the temperature follows the set temperature.

[0035] When the set temperature calculation function is OFF, the set temperature is set to the target temperature (fixed value). The control device 100 performs feedback control to calculate an operation command value (opening degree of the chilled / hot water two-way valve 31) for the chilled / hot water two-way valve 31 according to the difference between the set temperature (=target temperature) and the room temperature.

[0036] The temperature sensor 21 measures the indoor temperature of the room 20. The control device 100 inputs the deviation (target temperature - indoor temperature) between the target temperature (set temperature) and the indoor temperature to the feedback control unit 202. When the deviation (error) between the target temperature and the indoor temperature is input, the feedback control unit 202 outputs an operation command value for the hot and cold water two-way valve 31.

[0037] The hot and cold water two-way valve 31 operates in accordance with the operation command value (valve opening) output from the feedback control unit 202. This operation changes the indoor temperature of the room 20. The temperature sensor 21 detects the changed indoor temperature and inputs it again to the control device 100. Then, when the deviation between the target temperature and the new indoor temperature is input, the feedback control unit 202 outputs a new operation command value for the hot and cold water two-way valve 31.

[0038] As described above, in this embodiment, the feedback control unit 202 operates as a controller that performs feedback control by inputting the deviation between the target temperature (set temperature) and the room temperature and outputting an operation command value for the hot and cold water two-way valve 31.

[0039] In this embodiment, feedback control is performed using PID control, but this is not limiting and any control method may be adopted. The adjustment parameters (proportional gain, differential gain, integral gain) in PID control are set in advance when the air conditioning system 400 is shipped. Alternatively, an installation company may adjust the parameters as appropriate when installing the air conditioning system 400 in a building, or a maintenance company that maintains the air conditioning system 400 may adjust the parameters as appropriate.

[0040] Figure 3 shows the state of temperature control when the set temperature calculation function is OFF. Before temperature control starts, the room temperature t is 15°C, and the set temperature ta is the target temperature tb, which is 28°C (fixed value). In this case, the deviation (error) between the set temperature ta and the room temperature t is 13°C.

[0041] When the temperature control by the control device 100 starts, the hot and cold water two-way valve 31 is controlled so that the room temperature t becomes the set temperature ta (target temperature tb). As a result, it is assumed that the room temperature t reaches the set temperature ta (target temperature tb) 14 seconds after the start of control.

[0042] The room temperature t then exceeds the set temperature ta (target temperature tb) and reaches 34°C, then drops again to reach the target temperature tb (28°C). The room temperature t then falls below the set temperature ta (target temperature tb) and reaches 26°C, then rises again to reach the target temperature tb (28°C).

[0043] In this way, when temperature control starts, the room temperature t is controlled to become the set temperature ta (target temperature tb). In reality, the room temperature t draws a sine curve as it approaches the set temperature ta (target temperature tb), and the wave gradually decays.

[0044] Next, the temperature control when the set temperature calculation function is ON will be described below. Fig. 4 is a diagram for explaining the temperature control process when the set temperature calculation function is ON.

[0045] When the set temperature calculation function is ON, the set temperature is calculated based on the target temperature and the room temperature by the set temperature calculation unit 210. When the set temperature calculation function is ON, the target temperature and the room temperature detected by the temperature sensor 21 are input to the set temperature calculation unit 210.

[0046] When the absolute value of the difference between the target temperature tb and the room temperature t1 is d1, the control device 100 determines the set temperature to be ta1. When the absolute value of the difference between the target temperature tb and the room temperature t2 is d2, the control device 100 determines the set temperature to be ta2. In this case, the following relationships hold: d1 (= absolute value of the difference between the target temperature tb and the room temperature t1) > d2 (= absolute value of the difference between the target temperature tb and the room temperature t2), and absolute value of the difference between the set temperature ta1 and the target temperature tb > absolute value of the difference between the set temperature ta2 and the target temperature tb.

[0047] Specifically, the relationship is set temperature ta = coefficient K × (target temperature tb - (room temperature t - target temperature tb)). In this example, coefficient K = 1. Coefficient K can be set to any value. Then, the control device 100 performs feedback control to calculate an operation command value for the hot and cold water two-way valve 31 according to the difference between the set temperature and the room temperature.

[0048] The hot and cold water two-way valve 31 operates in accordance with the operation command value output from the feedback control unit 202. This operation changes the indoor temperature of the room 20. The temperature sensor 21 detects the changed indoor temperature and inputs it again to the control device 100. Similarly, the set temperature calculation unit 210 calculates the set temperature, and the feedback control unit 202 calculates the operation command value. In this way, the air conditioning system 400 operates the hot and cold water two-way valve 31 in accordance with the command from the control system 10.

[0049] 5 is a diagram showing the state of temperature control when the set temperature calculation function is ON. Before the temperature control starts, assume that the room temperature t is 15°C and the target temperature tb is 28°C. The set temperature calculation unit 210 calculates the set temperature ta using the formula: coefficient K × (target temperature - (room temperature - target temperature)). In this case, the set temperature ta = 41°C (= 1 × (28 - (15 - 28))).

[0050] In this case, the deviation (error) input to feedback control unit 202 is 26°C (=41-15). This value is double the deviation (13°C) when the set temperature calculation function is OFF. Therefore, when the set temperature calculation function is ON, temperature control is performed so that the temperature rises more rapidly than when it is OFF.

[0051] As a result, in this example, the room temperature t reaches the target temperature tb six seconds after the start of control. In this way, when the set temperature calculation function is ON, it takes less time to reach the target temperature tb than when it is OFF (six seconds for the former and 14 seconds for the latter).

[0052] The room temperature t then exceeds the target temperature tb, reaching 29°C, and then drops again to reach the target temperature tb (28°C). In this example, the room temperature t then fluctuates between 28°C and 29°C. As shown in Figures 3 and 5, when the set temperature calculation function is ON, the overshoot is smaller than when it is OFF (the former stops at 29°C, while the latter rises to 34°C).

[0053] This is because, in the former case, the deviation between the set temperature ta and the room temperature t becomes smaller as the room temperature approaches the target temperature tb, and when the room temperature t exceeds the target temperature tb, the set temperature ta falls below the target temperature tb. This causes the room temperature t to be pulled back to the target temperature tb so that it does not go too far, thereby reducing overshoot.

[0054] Figure 6 shows the state of temperature control when the coefficient K is changed. Figure 6(a) shows the state of temperature control when the coefficient K=1.0, Figure 6(b) shows the state of temperature control when the coefficient K=0.5, and Figure 6(c) shows the state of temperature control when the coefficient K=1.5.

[0055] As shown in Figure 6(a), when coefficient K = 1.0, the situation is the same as in Figure 5. The set temperature ta is calculated as 41°C (= 1 × (28 - (15 - 28))). The deviation (error) input to feedback control unit 202 is 26°C (= 41 - 15). Six seconds after control starts, the room temperature t reaches the target temperature tb, and thereafter the room temperature t fluctuates between 28°C and 29°C.

[0056] As shown in FIG. 6(b), when coefficient K=0.5, the calculated set temperature ta=34.5°C (=0.5×(28-(15-28))). The deviation (error) input to feedback control unit 202 is 19.5°C (=34.5-15). 12 seconds after control starts, the room temperature t reaches the target temperature tb, and thereafter, the room temperature t fluctuates between 28°C and 28.5°C. In this case, it can be seen that it takes longer for the room temperature t to reach the target temperature tb than when coefficient K=1.0.

[0057] As shown in FIG. 6(c), when coefficient K=1.5, the calculated set temperature ta=47.5°C (=1.5×(28-(15-28))). The deviation (error) input to feedback control unit 202 is 32.5°C (=47.5-15). Four seconds after control starts, the room temperature t reaches the target temperature tb, and thereafter the room temperature t fluctuates between 28°C and 36°C.

[0058] It can be seen that when coefficient K=1.5, the room temperature t reaches the target temperature tb more quickly than when coefficient K=1.0. However, it can be seen that in this case, the overshoot is larger than when coefficient K=1.0.

[0059] In this way, the user can change the coefficient K. For example, the user can set the coefficient K to 1.0, which reduces overshoot and quickly reaches the target temperature. Note that the example in FIG. 6 above is merely one example of temperature control, and the results of temperature control will vary depending on the installation environment of the air conditioner, the set parameter values, etc.

[0060] 7 is a diagram showing an example of a display on display unit 320. Display unit 320 displays the control results. The same graph as in FIG. 6(a) is displayed on the left side of display unit 320. The right side of display unit 320 shows that the target temperature is 28°C, the coefficient K is 1.0, and the time to reach the target temperature is 6 seconds.

[0061] Furthermore, the coefficient K and target temperature can be changed on this screen. The coefficient K to be newly set is input from the input unit 310. For example, if the coefficient K=0.5 is input and the "Change" button is clicked, the coefficient K is changed from 1.0 to 0.5. The control device 100 then performs feedback control using the coefficient K input from the input unit 310. As a result, for example, the result shown in FIG. 6(b) is obtained.

[0062] In this way, the user can change the coefficient K and verify how the indoor temperature changes as a result, thereby achieving optimal temperature control.

[0063] Also, on this screen, a new target temperature to be set can be input using input unit 310. For example, if a target temperature of 30 is input and the "Change" button is clicked, the target temperature will be changed from 28°C to 30°C. This will cause feedback control to be performed so that the room temperature is kept at 30°C.

[0064] As described above, display unit 320 displays the coefficient K and the time at which the room temperature reaches the target temperature, along with the transition of the set temperature and the room temperature relative to the target temperature.

[0065] 8 is a flowchart of the process executed by the control system 10. For example, this process may start when the power of the control device 100 is turned on. Hereinafter, "step" may also be simply referred to as "S".

[0066] When this process starts, the control device 100 determines in S101 whether or not a data change has occurred. When the coefficient K or the target temperature is input on the screen shown in Fig. 7 and the "Change" button is clicked, it is determined that a data change has occurred.

[0067] If there has been a data change (YES in S101), the control device 100 acquires the coefficient K and the target temperature in S102 and proceeds to S103. If there has not been a data change (NO in S101), the control device 100 proceeds to S103.

[0068] In S103, the control device 100 calculates the set temperature using the formula: set temperature = coefficient K × (target temperature - (room temperature - target temperature). For example, in the example of FIG. 6(a), the calculated set temperature is 41°C (= 1 × (28 - (15 - 28))).

[0069] In S104, the control device 100 executes control to determine an operation command value for the hot and cold water two-way valve 31 based on the set temperature and the room temperature. Specifically, when the deviation between the set temperature and the room temperature is input to the feedback control unit 202, the feedback control unit 202 outputs an operation command value for the hot and cold water two-way valve 31. In S105, the control device 100 updates the display data and outputs it to the display unit 320, and the process returns to S101.

[0070] By repeating the processes of S101 to S105, temperature control is performed and a graph such as that shown in Fig. 7 is displayed. The processes of S101 to S105 may be performed at predetermined intervals (for example, every second).

[0071] As described above, in this embodiment, when the absolute value of the difference between the target temperature and the room temperature is a first value, the control device 100 determines the first set temperature as the set temperature. When the absolute value of the difference between the target temperature and the room temperature is a second value smaller than the first value, the control device 100 determines the second set temperature as the set temperature. The absolute value of the difference between the first set temperature and the target temperature is greater than the absolute value of the difference between the second set temperature and the target temperature. Specifically, the control device 100 calculates the set temperature using the formula: set temperature = coefficient K × (target temperature - (room temperature - target temperature)). Then, the control device 100 performs feedback control to calculate an operation command value for the chilled / hot water two-way valve 31 according to the difference between the set temperature and the room temperature.

[0072] In this embodiment, the set temperature is not set to the target temperature (fixed value) but is calculated using the method described above, thereby making it possible to minimize the time required for the indoor temperature to reach the target temperature, as shown in Figure 5. This makes the indoor space more comfortable.

[0073] 1, 6, 7, etc., the present embodiment includes an input unit 310 for inputting a coefficient K, and a display unit 320 for performing feedback control using the coefficient K input by the input unit 310, and for displaying the coefficient K and the time at which the indoor temperature reaches the target temperature along with the transition of the set temperature and the indoor temperature relative to the target temperature. By changing the coefficient K, it is possible to set an optimal coefficient K while verifying how quickly the indoor temperature reaches the target temperature, whether overshooting is large, etc.

[0074] As mentioned above, there are three adjustment parameters in PID control: proportional gain, differential gain, and integral gain. Optimizing these parameters can improve control performance.

[0075] These parameters can also be adjusted by a construction company or maintenance company when installing or maintaining the air conditioning system 400 in a building. However, because these parameters are adjusted on-site by trial and error, it is not easy to adjust them to optimal values, and the adjustment takes time. Furthermore, in actual operation, unskilled building owners and managers would not adjust these parameters.

[0076] On the other hand, by varying the set temperature based on the target temperature and the room temperature, as in this embodiment, it is possible to improve control performance without adjusting the three parameters of PID control. Furthermore, by making the coefficient K changeable and enabling the improvement in control performance resulting from changing the coefficient K to be confirmed on the screen, even building managers and others who do not have the know-how to optimize the above three parameters can easily improve control performance.

[0077] In the present embodiment, the operating device that operates in accordance with commands from control system 10 controls the valve opening of hot and cold water two-way valve 31 to adjust the room temperature. However, this is not limiting, and the operating device that operates in accordance with commands from control system 10 may also control the rotation speed of supply air fan 41 to adjust the room temperature. Alternatively, both hot and cold water two-way valve 31 and supply air fan 41 may be controlled as an operating device.

[0078] [Note] The above-described embodiment is a specific example of the following additional notes.

[0079] (Appendix 1) An air conditioning control system that controls an air conditioning system that adjusts an indoor temperature to a preset target temperature, a processor; a memory that stores a program executable by the processor; the air conditioning system includes a sensor for detecting the indoor temperature and an operating device that operates according to a command from the air conditioning control system; The processor: When the absolute value of the difference between the target temperature and the room temperature is a first value, a first set temperature is determined as the set temperature; When the absolute value of the difference between the target temperature and the room temperature is a second value smaller than the first value, a second set temperature is determined as the set temperature; an absolute value of the difference between the first set temperature and the target temperature is greater than an absolute value of the difference between the second set temperature and the target temperature; The processor performs feedback control to calculate an operation command value for the operating device in accordance with a difference between the set temperature and the indoor temperature.

[0080] (Appendix 2) The air conditioning control system according to Supplementary Note 1, wherein the set temperature is a predetermined coefficient x (the target temperature - (the room temperature - the target temperature)).

[0081] (Appendix 3) 3. The air conditioning control system according to claim 2, wherein the predetermined coefficient is 1.

[0082] (Appendix 4) further comprising an input unit for inputting the predetermined coefficient; the processor performs the feedback control using the predetermined coefficient input by the input unit; The air conditioning control system according to any one of claims 1 to 3, further comprising a display unit that displays the predetermined coefficient and the time at which the indoor temperature reaches the target temperature, along with the progress of the set temperature and the indoor temperature relative to the target temperature.

[0083] (Appendix 5) The operating device is a two-way cold and hot water valve, The air conditioning control system according to any one of Supplementary Note 1 to Supplementary Note 4, wherein the air conditioning system operates the hot and cold water two-way valve in accordance with a command from the air conditioning control system.

[0084] (Appendix 6) A control method for an air conditioning control system that controls an air conditioning system that adjusts an indoor temperature to a preset target temperature, the air conditioning system includes a sensor for detecting the indoor temperature and an operating device that operates according to a command from the air conditioning control system; The control method includes: determining a first set temperature as a set temperature when an absolute value of a difference between the target temperature and the room temperature is a first value; and when an absolute value of the difference between the target temperature and the room temperature is a second value smaller than the first value, determining a second set temperature as the set temperature; an absolute value of the difference between the first set temperature and the target temperature is greater than an absolute value of the difference between the second set temperature and the target temperature; The control method further includes a step of performing feedback control to calculate an operation command value for the operating device in accordance with a difference between the set temperature and the room temperature.

[0085] The embodiments disclosed herein are merely examples and are not limited to the above. The scope of the present invention is defined by the claims, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0086] 10 control system, 20 room, 21 temperature sensor, 22 humidity sensor, 23 temperature sensor, 31 hot and cold water two-way valve, 32 hot and cold water coil, 33, 34 flow path, 41 intake air fan, 42 exhaust fan, 51 air conditioner, 100 PLC, 101 processor, 102 memory, 200 server, 202 feedback control unit, 210 set temperature calculation unit, 300 terminal, 310 input unit, 320 display unit, 400 air conditioning system.

Claims

1. An air conditioning control system that controls an air conditioning system that adjusts an indoor temperature to a preset target temperature, a processor; a memory that stores a program executable by the processor; the air conditioning system includes a sensor for detecting the indoor temperature and an operating device that operates according to a command from the air conditioning control system; The processor: When the absolute value of the difference between the target temperature and the room temperature is a first value, a first set temperature is determined as the set temperature; When the absolute value of the difference between the target temperature and the room temperature is a second value smaller than the first value, a second set temperature is determined as the set temperature; an absolute value of the difference between the first set temperature and the target temperature is greater than an absolute value of the difference between the second set temperature and the target temperature; The processor performs feedback control to calculate an operation command value for the operating device in accordance with a difference between the set temperature and the indoor temperature.

2. 2. The air conditioning control system according to claim 1, wherein the set temperature is a predetermined coefficient x (the target temperature - (the room temperature - the target temperature)).

3. The air conditioning control system according to claim 2 , wherein the predetermined coefficient is 1.

4. further comprising an input unit for inputting the predetermined coefficient; the processor performs the feedback control using the predetermined coefficient input by the input unit; 3. The air conditioning control system according to claim 2, further comprising a display unit that displays the predetermined coefficient and the time at which the indoor temperature reaches the target temperature, along with changes in the set temperature and the indoor temperature relative to the target temperature.

5. The operating device is a two-way cold and hot water valve, 5. The air conditioning control system according to claim 1, wherein the air conditioning system operates the hot and cold water two-way valve in accordance with a command from the air conditioning control system.

6. A control method for an air conditioning control system that controls an air conditioning system that adjusts an indoor temperature to a preset target temperature, the air conditioning system includes a sensor for detecting the indoor temperature and an operating device that operates according to a command from the air conditioning control system; The control method includes: determining a first set temperature as a set temperature when an absolute value of a difference between the target temperature and the room temperature is a first value; and determining a second set temperature as the set temperature when an absolute value of a difference between the target temperature and the indoor temperature is a second value smaller than the first value, an absolute value of the difference between the first set temperature and the target temperature is greater than an absolute value of the difference between the second set temperature and the target temperature; The control method further includes a step of performing feedback control to calculate an operation command value for the operating device in accordance with a difference between the set temperature and the room temperature.

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